选取重庆市2000～2009年MODIS EVI时间序列数据,采用BLSE去云处理方法,首先进行EVI时间序列的变化矢量分析,研究EVI对干旱的响应情况;再选取4个典型区域,研究2006年在干旱严重发生时EVI与气温、降水之间的关系;最后基于时间序列植被状态指数(VCI)和降水距平百分率研究2006年重庆大旱的时空分布规律。结果表明:2006年重庆夏季EVI明显低于其他年份相应时间EVI的平均值;重庆市夏季旱情发生期间主要以高温少雨的天气为主;除了东南部外,其他大部分区域均处于严重干旱的状态下。 Select the MODIS EVI time series data from 2000 to 2009 in Chongqing, and use BLSE to cloud processing method. Firstly, the change vector analysis of EVI time series was conducted to study the response of EVI to drought. Four typical regions were selected to study the effects of drought in 2006 The relationship between EVI and temperature and precipitation in serious occurrence was studied. Finally, based on time series vegetation status index (VCI) and precipitation anomaly percentage, the spatial and temporal distribution of drought in Chongqing in 2006 was studied. The results showed that the summer EVI in Chongqing in 2006 was obviously lower than the average EVI in other years; the main weather was the heavy rain in summer in Chongqing; except for the southeast, most of the other areas were in severe drought under.